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## Physics - Questions and AnswersPage 3

21.

 Find the wrong pair (a)Velocity – [LT-1] (b)Force – [MLT-2] (c)Work – [ML-2T-2] (d)Momentum – [MLT-1]

22.

 Unit of Acceleration, Force, Work and Impulse respectively? (a)Joule, Newton second, Newton and Meter per second² (b)Meter per second², Newton, Joule and Newton second (c)Newton second, joule, Newton and Meter per second² (d)Newton, Newton second, Meter per second², Joule

23.

 Unit of Current, Power, Heat and Potential difference respectively? (a)Ampere, Watt, Calorie and Volt (b)Volt, Watt, Ampere and Calorie (c)Calorie, Ampere, Watt and Volt (d)Watt, Calorie, Volt and Ampere

24.

 Newton’s first law is also called as (a)Law of moments (b)Law of inertia (c)Law of energy (d)Law of momentum

25.

 The working principle of a washing machine is: (a)centrifugation (b)dialysis (c)reverse osmosis (d)diffusion

26.

 Fat can be separated from milk in a cream separator because of (a)cohesive force (b)gravitational force (c)centripetal force (d)centrifugal force

27.

 A man is at test in the middle of a horizontal plane of perfectly smooth ice. He can move himself to the shore by making use of Newton's (a)first law (b)second law (c)third law (d)all the laws

28.

 A car is running on a road at a uniform speed of 60 kmph. The net resultant force on the car is (a)driving force in the direction of car's motion (b)resistance force opposite to the direction of car's motion (c)an inclined force (d)equal to zero

29.

 For a particle revolving in a circular path with constant speed, the acceleration of the particle is (a)along the tangent (b)along the radius (c)zero (d)along the circumference of the circle

30.

 A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously? (a)They must have the same volume (b)They must have the same density (c)They must have the same mass (d)They must be dropped in vacuum